db19c Create Master Key in a new PDB

When a database is TDE enabled, as soon as a new PDB is created, this PDB needs a master key to be created:

Example:

SQL> ALTER SESSION SET CONTAINER=EMSTST13C;

Session altered.

SQL> ADMINISTER KEY MANAGEMENT SET KEY FORCE KEYSTORE IDENTIFIED BY welc0me WITH BACKUP;

keystore altered.

SQL>